Mandrel



(No ModeL) S. P. M. TASKER.

MANDREL.

N0.'331,578. Patented Dec. 1, 1885.

WITNESSES:

Uwrrnn STATES PATENT Urrrca.

STEPHEN P. M. TASKER, OF PHILADELPHIA, PENNSYLVANIA.

MANDREL.

SPECIFICATION forming part of Letters Patent No.331,578, dated December1, 1885.

Application filed July 22,1885. Serial No. 172,276. (No model.)

To aZZ whom it may concern.-

Be it known that I, STEPHEN P. M. TASKER, a citizen of the UnitedStates, residing in the city and county of Philadelphia, and State ofPennsylvania, have invented a new and useful Improvement in Mandrels, ofwhich the following is a specification.

My invention relates to the class of mandrels which are known asroller-mandrels, and which are provided with ellipsoidal friction'rollsmounted in bearings in a stock or case, such a mandrel having beeninvented by me and patented to me in and by Letters Patent of the UnitedStates No. 151,323, dated May 26, 1874.

The intention of the employment of a mandrel of the foregoing class isto obviate friction between the interior surfaces of the tube and theball of the mandrel, and to permit of the more ready passage of the tubeover the mandrel and withdrawal of the mandrel from the tube.

The object of my present invention is to provide a mandrel of theforegoing class which is provided with three ellipsoidal rolls, the axesof which are arranged at an angle to each other and each roll at acommon angle to its neighbor, and which rolls are adapted to be adjustedthe one with respect to the other, so as to change the relativeinclinations of their several axes.

My mandrel is especially designed for employment in connection with acertain apparatus for manufacturing tubes and for reducing andstraightening metal tubes, which, briefly stated, consists of a set or aseries of sets of rolls, each of which sets is composed of threeconcave-faced rolls arranged at an angle to each other and each roll ata common angle to its neighbor, so that the concave surfaces of all ofthe rolls form a circular pass which surrounds a tube passed through it,the said machine constituting the subject-matter of several applicationsfor patents executed by me and filed in the Patent Officecontemporaneously with this application.

Apparatus embodying a good form of my invention is represented in theaccompanying drawings and described in this specification, theparticular subj cot-matter claimed as novel being hereinafter definitelyspecified.

In the drawings, Figure 1 is a side elevation of a mandrel embodying myinvention. Fig. 2 is a face view of the same. Fig. 3 is a rear view ofthe same, section being supposed through the mandrelrod in the plane ofthe dotted line mm of Fig.1, and sight being taken in the direction ofthe arrows upon said line. Fig. 4 is a fragmentary longitudinalsectional detail taken through the stock and through one of the bridles.Fig. 5 is a perspective view of the entire device. Fig. 6 is a viewsimilar to Fig. 3, showing four rolls in the stock.

In all of the figures the rolls occupy what I assume to be their normalposition.

Similar letters of reference indicate corresponding parts.

In the drawings, A represents the mandrelrod, which is a part of orconnected with the stock B, which is conveniently made as a triangularprism. Against the face of each parallelogram or side of the prismaticstock is applied a bridle, G, conveniently made of the shape representedin the drawings, which carries or with respect to which is journaled anellipsoidal or spheroidal roll, D. Each face or side of the mandrelstock is provided with a segmental way, 1), within which is fitted asegmental lug, 0, formed upon the under side of the bridle. A segmentalslot, 0*, is formed through the bridle and through the lug thereon,through which slot passes a threaded stem,

E, secured to the stock and armed with a nut,

e, which is adapted, when screwed down, to bind the bridle fixedly inany given position which it is capable of assuming with respect to theface of the prism or stock to which it is applied. It will be obviousthat by virtue of the segmental ways and segmental lugs fitted theretoeach bridle is capable of being adjusted with respect to the stock. Therolls are mounted in the cheek-pieces of the bridle by means of journalsd, which are either secured to the rolls and play in suitable bearingsin the cheek-pieces of the bridle, or else are secured to saidcheek-pieces of the bridle and are entered within suitable bearingsformed in the rolls. Each bridle is, as shown in Fig. 3, of greaterthickness at one side than at the other, so as to impart a pitch to theaxis of its roll, and thereby occasion the disposition of said axis at aslight angle to the plane of the side face'of the stock.

As an expedient of construction, each bridle at its innerend issegmental and abuts against a segmental shoulder, 12*, formed upon thestock. The threaded stems may, if desired, be provided with fixed headsand be screwed into threaded sockets in the stock. The form of thebridles is conveniently that shown. It may, however, be modified. It is,however, essential that the cheek-pieces of the bridles, to which thejournals of the rolls are applied, should be rounded, as shown in Figs.2 and 3, so as to lie below a circle circumscribing the three rolls inthe region of their greatest diameter, in order that the bridles may nottouch the tube as it is passed over the mandrel.

Having thus described a good construction of my device, it will beobvious that each roll is capable of an independent-adjustment withrespect to both of the other rolls, and that by means of this adjustmentthe axis of each of the rolls may be inclined from a line which is rightangular to the longitudinal axis of the mandrel and stock. In whateverposition the rolls are adjusted, they bear upon each other near theirends, so that theinward thrust upon them is taken off their journals andborne upon their rolling-surfaces.

In employing my said mandrel with a set of three angularlydisposedconcave faced rolls, the axes of which are correspondingly inclined toeach other, the mandrel is to be inserted in the pass of the rolls, andthe rolls of the mandrel are to be adjusted so that their respectiveaxes are parallel with the axes of the rolls of the mill in connectionwith which they respectively operate, and when the said rolls of themill are adjusted a similar adjustment to preserve the parallelism ofthe axes is to be made in the rolls of the mandrel.

I contemplate employing a series of mandrels of this class in connectionwith a series of rolls of the class referred to.

It is obvious that, if desired, the frames or bridle can be so set thatthe rolls are parallel, that the mandrels can be employed in connectionwith dies instead of rolls, and that they are adapted to be used for therolling of metal either hot or cold.

Instead of the threaded stems and nuts, other means for retaining thebridles in the different adjusted positions may of course be resortedto.

It is also obvious that by making the prismatic stem quadrangular, andby suitably proportioning the rolls, the device is adapted to beprovided with four rolls and bridles, as shown in Fig. 6, or to becorrespondingly fitted with a greater number than four rolls.

The segmental ways and lugs are convenient devices to insure accurateadjustment; but they may be omitted, or, if desired, other kindredconstructions resorted to in their stead.

Having thus described my invention, I claim 1. The combination, inaroller-mandrel, of a series of three or more ellipsoidal rolls, theaxes of which are inclined to each other, substantially as set forth.

2. The combination, in a roller-mandrel, of a series of three or moreellipsoidal rolls, the axes of which are inclined to each other, bridlesfor supporting the rolls, and a stock to which the bridles areconnected, substantially as set forth.

8. The combination, in a roller mandrel, of a series of three or moreellipsoidal rolls, the axes of which are inclined to each other, bridlesfor supporting the rolls, a stock to which the bridles are connected,and means for adjusting the bridles with respect to the stock,substantially as set forth.

4-. The combination, in a roller-mandrel, of a prismatic stock, a seriesof ellipsoidal rolls, the axes of which are inclined to each other, andwhich correspond in number with the side faces of the stock, bridles forcarrying said rolls, which are applied to the respective faces of theprismatic stock, and means for adjusting the bridles with respectto thestock, substantially as set forth.

5. The combination of the stock, the segmental ways in said stock, thebridles pro vided with segmental lugs and with slots, nutprovidedthreaded stems for effecting the retention of the bridles in differentadjusted positions, and ellipsoidal rolls carried by the bridles,substantially as set forth.

6. The prismatic stock provided with the segmental ways and thesegmental shoulders, in combination with the bridles, provided with thesegmental lugs and with slots, and also provided with ellipsoidal rolls,and with means for securing the adjustment of the bridles with respectto the stock, substantially as set forth.

In testimony whereof I have hereunto signed my name this 17th day ofJuly, A. D. 1885.

STEPHEN P. M. TASKER.

In presence of- J. BONSALL TAYLOR, JOHN J OLLEY, Jr.

IIO

